Attachment for pneumatic hammers



Oct. 13, 1931.

J. GALAZ 1,827,647 ATTACHMENT FOR PNEUMATIC HAMMERS Filed Nov. 9, 192a l6 3 i v /5 l o 5 Mr I? I Juan ala'z,

ATTORNEY Fatented' Oct. 13, 1931 UNITED STATES OFFIE JUAN GALAZ, 015 LOS AN GILES, CALIFORNIA ATTACHMENT ron rNEn aaTIc germane Application filed November 9, raga. Srial No. 315,237.

' cally pointed out in the appended claim.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughoutthe several views, and in which r 1 Figure 1 isan elevation, partly in section, of the rear portion of a hammer provided with my'invention. a

Figure 2 is a face view of the grooved ring member.

Figure 3 is an elevationof the sleeve.

Figure 1 is a sectional view of the plunger.

As shown in Figure 1, the handle carrying part 1 of the hammer is threaded to'the body 2 in such a manner as to leave a space between the rear end of the body and said part 1, anda ring 3 fits in this space. The interior circumference of the ring forms a shoulder 4 which is engaged by a shoulder formed by a head 5 on a plunger 6, the front end of the plunger being closed. When the plunger is in itsforward position, its rear end is flush with the rear face of the ring.

A sleeve 7, having perforations 8 at its center, has its front end fitting in the larger diameterof the ring and said sleeve extends through the part 1 and is held in place by a plug 9 fitting in a threaded socket 10 formed in the rear end of the part 1. The perforated part of the sleeve is located in theair cham- V :ber 11of said part 1 so that some of the air extends through the sleeve and bears against the plug 9. Thus the spring tends to hold the plunger with its head resting against the shoulder 4.

The front face of the ring 3 is formed with an annular groove 13 which is in communication with the air passages formed in the internal member 14.- of the body and said ring is also formed with the air ports 15 which connect the groove with the ports 16 in the part land which are in communication with the chamber 11."

Thus it will be seen that the reciprocating member 17 of the hammer, on its back stroke, will strike the plunger and force the same rearwardly against the action of the spring l2 and that after the head of the plunger passes the perforations 8 in the sleeve 7, air will be trapped between the head of the plunger and the plug 9 so that this air cushion will act in conjunction with the spring to resist the further backward movement of the member 17 so that the shocks incident to the backward movement of the member 17 are absorbed and are not communicated to the hand and arm of the user. member 17 moves forwardly, the spring 12 will return the plunger to its normal position.

The part 1 is locked against turning movement by a sleeve 18 slidably but non-rotatably l mounted on the body 2 and connected with the forward end of the member 1 by the latches 19carried by the sleeve 18 and engaging the notches 20 in the member 1. The sleeve 18 is held against rotary movement by the set screw 21 in the body 2 engaging a groove 22 in the forward end of the memer 1. i

As the sleeve 18 is prevented from rotating As the and is locked to the member 1 by the latches I 19, it will be seen that said member cannot rotate and thus become loose without moving the latches to releasing position.

It is thought from the foregoing description that the advantages and novel features a i v v I 1,825,647

" parts, provided that such changes fall within the scope of the appended claim. 7

What I claim is An attachment for pneumatic hammers in- Q eluding a handle carrying member having an air pressure chamber and a tubular portion to receive and be secured to a body for reciprocating, the driving member actuated by air pressure from the chamber, an a'nnu- 10 lar member positionedLbetweenthe handle carrying member and the body, an annular shoulder on said annular member, a recessed plug removably secured to the handle carrying member, a sleeve seated in the recessed p15 plugand engaging the shoulder and proyide'd withapertures in communication with the air pressure chamber,a recessed plunger slidablein the sleeve to be moved-in one direction by the driving member, a flange on f -20 theplunger to engage theshoulder to limit g, 1

the movement of the plunger in anopposite Y direction, and a cushioning spring engaging I the -plug and seated in the recess of the a plunger to retard the movement of said plunger in the first named direction, said V phmger'during the last named movement adapted to trap air 'between itself, the Sleeve I and the-"plug to absorb shocks from the driva ing member to the handle carrying member, 7 i 3 In testimony whereof I aflix my signature.

" .JUANGALAZ. 

